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| Evaluation of mangrove structure and condition in two trans-boundary areas in the Western Indian Ocean Bandeira, S.; Macamo, C.C.F.; Kairo, J.G.; Amade, F.; Jiddawi, N.; Paula, J. (2009). Evaluation of mangrove structure and condition in two trans-boundary areas in the Western Indian Ocean. Aquat. Conserv. 19: S46-S55. dx.doi.org/10.1002/aqc.1044
In: Aquatic Conservation: Marine and Freshwater Ecosystems. Wiley: Chichester; New York . ISSN 1052-7613; e-ISSN 1099-0755
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Mangroves Reforestation West Indian Ocean [Marine Regions] |
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2. A total of 135, 10 m x 10 m quadrats were set in the outer, middle and lower parts of the mangrove forests at all sampling sites. Measurements included stem diameter at breast height (DBH) and height of adult trees (i.e. all trees with stem diameter more than 2.5 cm). Young trees (with stem diameter of less than 2.5 cm) were classified as juveniles. To assess forest condition, trees within the quadrat were classified into intact, partially cut, coppiced, die back and stump. Pole quality was appraised through the classification of the lead stem into three categories-straight, semi-straight and crooked poles. 3. The results indicate different levels of I exploitation with Mn oji I and Mngoji 2, the most degraded sites, having stump densities of 959 stumps ha(-1) and 592 stumps ha(-1), respectively. Most sites had mostly poles of inferior quality (crooked poles), but high densities of straight and semi-straight poles were found in Mngoji 1 (742 stems ha(-1)) and Saco (636 stems ha(-1)). 4. Natural regeneration was observed in most sites but not for all species, with adequate regeneration in Saco (14766 saplings ha(-1)) and Mecufi (14706 saplings ha(-1)), while low regeneration was recorded in Mngoji I and 2 (2212 saplings ha(-1) and 4799 saplings ha(-1), respectively). 5. These results indicate the need for improved mangrove management and replanting especially in mangrove depleted conservation areas of southern Tanzania. Copyright (C) 2009 John Wiley & Sons, Ltd. |
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